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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d69b16a6f8dff20738e231b67c18937f18f1172a7b9da4a810823a1d14a0a8f' 
  AND token = 'oGHjum1eF6Pzu+abqSCt6VU3Wk2etpHcmMXlVih9sRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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