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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '645860fec0b3d62a2092e65bce8230385cf0a41933668d330b8ad6ba96ecdb3b' 
  AND token = '9/4ps8E5xJhzeJr/6XNOfgbUzKUbg2Gr4UX8XtTUUdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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