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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26cda2f36433c9fa0962229542774f62f7e13ea015f5b5b314df938437af73e8' 
  AND token = '8ElazkpvyOC+0hj2cmXwST9dc95XEoofgG7yRcrF0yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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