Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '756fa5888038c6033856095d3065715668d36fc1db7bc79f7d53e08f797341b1' 
  AND token = '7W2CtDIKJ02gfRKrZOoEkb1jN8FpvcUnX+YzUDAjyRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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