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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3d8d2df31b634aad57c5a1d4a1d3f24f769e7a7f195f04ba1b89853c7ba504c' 
  AND token = 'cwOoT1udzC7/135U2RFIW5EfXqv6y/MBlvk4ztBs/yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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