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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cf11cfb8bd01e34dd94afb91c45fb7bf13347628de5c2b6a94d058722e71168' 
  AND token = 'z02wEB6hkj6bbD6bohEbqFiENV2YTff1OB6cTyZS4p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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