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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70257fe6f8d75f80619b839e30832aced97784e94e3cf836d38a1fb8f5d58909' 
  AND token = 'h3RChKlCDmzxGkXJ+0j7yyYpLOpQp+PeLE4sRt4sK9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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