Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a5d63c85a15048472a2e7b9299e61d2e05975410c4e96880b4e2504c628446b' 
  AND token = 'KOQXmhg6ozBH6FI73cwzBDsnPBsaa+5eN0x++CZzzcA=' 
  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"
    }
  }
}