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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33cb9cec6e5b5e13b01a54462e9b986cbc5a0adade11eb66095c87a3ccb06e18' 
  AND token = 'ik2FGVBsM009v9LmHBNP928VMrl68ezw+yVh/LRycA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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