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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f21ed65efe1fe9c86ad6aea482fef3d50c714f388c3c0c042cdbe2a64796a8fe' 
  AND token = '8TG7iERpYWhS0qTVVKVdvyJIly0Gu7BriG2pK9apMRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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