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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fcd846e7f1c893d6b5f553a3869d715b984c2ceb8376d5a52c4accfb51ed197' 
  AND token = 'oSg8/a28W0ieaf8cT097c1qU2QGFR3Wu3MQ5ZxBT+UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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