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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7811e4b0a582007e3980e83cd755b57f40132b684ad9dcbc9000bb11a09e3452' 
  AND token = 'UXtFf84wMoCLCyPWuT4J088f3IEGmBmpV8qivq93gX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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