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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a07bea47334e444cc751b2dba81e8cb73232b315d4455f45bcd08e2f91cf9f7d' 
  AND token = 'kuTHm3GXGi7QltsgZt64HxFH5Iha5YhAQlAZpnP3oQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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