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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5820f841d7cda7ac499d3f604402033498823cfa4f0de7ddec2eacfaa3150d28' 
  AND token = 'kmdv8+Pqv3iZbnJ3twNYEBlNOIyDHXKLskbyodUL8CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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