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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a1b751db292b03e5c8248daac4a1d189c1d9e61ba6bec1885076a9feba74634' 
  AND token = 'yj9PMbAw18rwRqHmGY/wLvLq/iiFOHDD3NOBDNvQBEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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