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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f72ba64f4e925f71552414f4c7ca26c03ff003f6eb639d98f827a95003435a7' 
  AND token = '5IC0IMxZHSVrXs7pf3TbzAwEjdRh5RKIWDSsWrGVJt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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