Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aea195496dcd95b703e0b716f83bf14405bc8dea659c7230d6fdbc00bb0be47e' 
  AND token = 'EGGlSATfem6jhJAfsugzR3BI5/8j/3irkhi+yBOcs3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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