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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0ea1c26f523d5c6d59c21b45b4c72a4d2595db3d30150d58a4ee0fa40bcfbf8' 
  AND token = 'cieln8T33cQiq7UuLIh7wQvAHaqA3d4brUEWIMyXMPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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