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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed84b2c7e84939c10f047aa0878b14558bb10a81326816b023423d270138a4e7' 
  AND token = 'f5fAUMiJ9Erq9+X/cdN2PzYB59Imk8ZCsM5xE3Hx60Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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