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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ed822427733c3537f71c0bec5cb4609e30795a87a95da5bb0f42bd6a9f64bc8' 
  AND token = 'FkEI2e4C8ekFQRXzQyD0Sor+qTsquRWJO08l5q+W/ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}