Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87cbca250c880031d2f220baf2797ba78fa70ac5fc687955284219c72cad7737' 
  AND token = 'MZSB3Z3jdLwS8ZA92QvmykyBz1uOSARNGAa2GMsf9M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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