SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed41555743d64f7679ee150f7242fcf0cf83ff591a0b3f099f7d0309092062ed' 
  AND token = 'VamJg8Ds9GHjZhfVmj9ct/VPE0+GvpDLqNOw7/RLOjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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