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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdd17a493a9eb8e43373f7c4663764aca43c0c48bc4ae605a75f59ff9191d786' 
  AND token = 'uLTyNixi50P9JLWa7Ky9E2eVIm9dvOXXd1YqbogGR+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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