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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac5a73a92199c6af4eb22a02295b41f77f59360a9026dc0a45f02fe0a67ced01' 
  AND token = 'kiCTP+k6BwzaN2V41WuVC4sCCXWh3jMbx0DHh55QLbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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