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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a566d412692b28d2675ad77c45c2f62b67e0fc9990fca02f18face4d10ca1129' 
  AND token = 'tyYkJbUC0dj312s/kUDX3u4tIsf4aMhhjX+tT4pm0Os=' 
  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"
    }
  }
}