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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a8386c204063aad21431fd299c34fb9d031fb8b144220f9644acc940f0df33' 
  AND token = 'GPIL85mNweN9btEL+fpWUImDeHSzKNhUMApAlCkMNh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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