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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18fc48ac648229739a9269992f0bdcac69e4b136191fceba237330fb81f1eb6a' 
  AND token = 'fW8SSPoIJsz1PqgWF7me5l1y63Z9dcmcUUrf81RE7cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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