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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f48f9f7fd65b331f1edac353bddf280c2f7ae10a1e5a4a6a7945a70ae4586ec6' 
  AND token = 'kGLGQWD7UF6A3jsurlSFrOYBt08mob4eE3pjhlofK8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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