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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e8fbdb32c3ea11491b4fb3eec5ebfb1b1a990b1315c3689f48fb68759345348' 
  AND token = '+F15PPcgOFDzqf0fkkqvQh+NQr/1aBKuh20LTpjafGQ=' 
  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"
    }
  }
}