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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc701ba26ddb7b762a93b0c187c3781849809a39a56a3dc00929537c35a6587e' 
  AND token = 'awxLG6ndl1XRfcqdFJcFxR9/41gZNPRFGQMd0PoWPiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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