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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a228b79ef7569964b0a0032eccb07bc3331b57824cde2224cac7b04ff737ac1' 
  AND token = '/NarhBoNvM4kLDJ9O7/bFNfUj7PY7zFyMyP9C2AIGHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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