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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99dd3245074e6d5bc2a7beeb69a1672cf926dc66ee7bb08b5229c8525951e4d' 
  AND token = 'hu+UOTz2gZiBjZjh8E7aSTOW5YlA9I6K22JL+0jUox4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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