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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0f2b4cb0019c722189ae2e71a6c8d89b7a8ec5dcd77be8bbd79f45c3edd1b1' 
  AND token = 'erYnBX7KaAsYbpOtWuNHYLKyKh5iT7Fgb7Jfusmntzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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