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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24872e093412571240308b2956253e5ec330f522f9d6f0b6650415fe124fcf2a' 
  AND token = 'Jit/eM8NZsTdJ45K/gV7n95CqpG3sH7a7aEcIcbnm4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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