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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6f74115e3494bb70c237482baa35ea3b4e525acb84c86ef4368540269d9f624' 
  AND token = 'jLbT+H4VPi/1Fl8sdAxBhGXXnKFqPsl06oilEyiPEIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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