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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a25c0766acc75a4ed3c74e90f1c220a43ed5bd0a30e647e93d5e7d641ce3dc0' 
  AND token = 'CDAvSLHEIPMwuahsMNWNWRSki6g/x8xeOx4PNj8sLUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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