SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b14b2b6957e0a8f9a553d615754b1e5afca13ed4798ef36cb2c38cd7680de23' 
  AND token = 'hwnT4sXbo+bejv0Nnxg1k6a/vjyZpOheyG51xuWPVFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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