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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f32a339a360393f5f52fe9dfe054311ca51744c0034cfa68de045755a19b6f62' 
  AND token = '/LmWCBLU0KqRVEAthMSnSra6VwqZFb3rcG2bRnVMDCQ=' 
  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"
    }
  }
}