Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '577105013b6b82f4e9e08f472c95adb40be8f65108c2f14dc9fc01cf163dfa88' 
  AND token = '6eGrJfko4fJ14DrWDKrdaf9ABxlMNYI8/RzGbxqKHDQ=' 
  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"
    }
  }
}