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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76c3cd9a0846cf4aca2368f73202d53451fd450efc5c47f4f7043653625b4d7' 
  AND token = 'OoVJDkJz6QfxQ/2tMNC/sjDK4OHFT3nPK2jjABasvMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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