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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa67eaaa3db895e2450601fa03ec71c0ff067a4533817584971a402ce1aa5671' 
  AND token = '8oSoYycAFG56J/gA8N1v48NUh75C2aPPa8zlw7e+Z5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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