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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb5d9fc55e3b5b51e88656c3f5e4cb94aa8fa9b4e32bf4e9b7fdba29dcb51f6' 
  AND token = 'nlTFZrzXho2IjELVhcjvS9ARbkogR9uzXiCK8y+W260=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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