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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6bb05d9190d3cda2dc320b3a1c7f05cb581f1b6372dd86dbc9cf999208f5e2e' 
  AND token = 'C+IknDD07Kh7EbE6JqdSuKnv+PME1FwU9uVdtSRBKFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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