SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '632e11045a3b7e802fc011add933bcc5d8bb3069f7417bfe1277c39c68357268' 
  AND token = '/TGPYILAPX24sUXAH9qdgJaVR6v/gIOPZmlUUBf9VsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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