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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03bea15de53ede699bb69ecd7a7ec3d68e75e9cf103489d78a3c5ac074e6f2cb' 
  AND token = '3H/TyTxcKGZtVDLnrd7oxMp7gqEehdrEBCp94KG6bPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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