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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc35b490017319ccb483e2512a5453027e43c95e20446cad8b7082e07e6c01e3' 
  AND token = 'J4C//XsSYV0eF+XZdCNHF9ySWy/5aZlDMEB/kOxZkQI=' 
  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"
    }
  }
}