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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06d33ddec3450d32af528f379c1753aee804e6d902c9ba2a99b28b575a79aca5' 
  AND token = '1KLTMS4LdrTOSrU+l6PrFf0wM5lCLnVxf/QmxkJrgfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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