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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5f147827b4e863bd829146e3f432140d7a951648f76a19c62b17e6c7a7dcd0d' 
  AND token = 'M75Ru/eyBZ6dPnDUL+mkBYV8aTo+ToPvCl6ecClu3dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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