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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8763d72009765947449c7d48d6b6d01f0afb6d31b20ffae192fa6f2a4ad8148f' 
  AND token = 'qV0RBYERicRBfFy/SMNppHWbjqatYT4bcKdpp6D2orM=' 
  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"
    }
  }
}