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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae6eb4c99195645d58bc8c845e850476221e79a24734e26602e6a12fa6b1dec' 
  AND token = 'bUzJj67qxw3/1liepdButiFc75GA8L+tCf//17rsQQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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