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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e720d3ea5ca179466478e0326d61b5252e8d02820da8d070506b075d0aed2461' 
  AND token = 'W8yFdEgAyQxY0IueZuCIC/rt4w7UcU4WAjmdoy9mzuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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