Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b2d020aabb13cccc9923c9ad637984837132db2ea08263e2a29c7805869ec6e' 
  AND token = 'jsaC0yRtcGFPIr3efrfqvVyYG3zlpLHl78ng+UXCo0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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