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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a6ece70aa23a6aa4b358c2752ec6ae66114daff4ff5ac7d8a84bdf2db17b2ae' 
  AND token = 'aUZgyAxZ+j0UGtQcC9WEnZoh6+Iz14Y+DX6PUXoSXaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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