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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f897b2c7ac8cbd87269a15daa9fdc5cb6ba6f3dc48557f9a181db382589bb606' 
  AND token = 'EMP1H8ONPb7UuTlTMtKb0py3C8KCZmnhIlk0rSiKeZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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