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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d9df554bfc3b3c5af41b29d5775002a1127842ef9ec47e3a51ea79aae561be' 
  AND token = 'GaURC5VZ58BAPR3th0S1KaEVKbQVlLBz54B9AORg8HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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