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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3c65427112d71a07b7231fa0821c5d1d5428e6a37e01db0438786c5d61f42a8' 
  AND token = 'v4XQKa5OCOaUMjA6LiHAJn2XN0lv/OR8gaPkITqDxHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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