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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '525948b6bedc381f21a60bfc8fc9e77b44b23ad3f1a043cf0ba24dc71c430ebe' 
  AND token = '+3c2BaY7THiSxa9W7HKot4myiDHv7TMirchCJtGYn9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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