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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ffdcd0c4d9c4a73e0ff46a31df5ca30f274d2c3f99dbe400f3396777fde355' 
  AND token = 'ZRiCga5Z3xqs2L7z0XK3v9jMmjEZERrKJx6jvrzWIgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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