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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce94a81ba0d6d98714f58c1f2c196b525f36e8cc8a353ab2b2d27adef50c990' 
  AND token = 'pSU2fArVZm2fUIOmBSe4a4s0bO4+CH+lrMDO5hLOlsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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