Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d4a8f2ef3d4495c22b62999131bd312fd4075210148f9a1f14855a516628abf' 
  AND token = 'KDjLBK1fDCTbDu/oTKbbhNN6r5kc98gZojmZFaARknM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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