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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54cee1a1b47eaab1ba760250c9ead1042b861783d073b280ba63ac1828602b3c' 
  AND token = '/JbMb10CH0Ps2Yc+E8AHmro9mqS3/DsRFCLxKoTOzFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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