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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec8c9628b31b707ecdf9e7cb41283d2819e08c5135d28c6aafd00c899dca88f' 
  AND token = '0937G6iTAwH0LR9AWYsy3u+QODNNKwNvVYGsa9a4R+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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