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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16daf99736ac7fb0240b5cd4fe61c534841e123b477aa9952438d0c6f396a5c2' 
  AND token = 'YdiTQvocOy6SHImyiPrJpzjkqC0VfPf01CaWkb0Fo1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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