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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7dc8876970221c0e7939374f81b0a5efc15013277ac857e437fce44d64e3dad' 
  AND token = '/uoIRB3aLjoL+mUa2QWxWp5BUxLM4ztpl9PaHF8EmcM=' 
  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"
    }
  }
}