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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b34e794926564b7df694a4340963a22ed43cd08a948494344cbac7d2c2ce6931' 
  AND token = 'VtG12tCCSyWtbdVesPtOCEqqEWuPi8rC3dw8rUw3uFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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