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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '726f830f9d15f99e3392f5f9d2982c813839e42bbab7ee01f7cb9a5e1ed7a341' 
  AND token = 'VNTTz9GWyw0YBLWlp8/N74ImGIGtnQIyEN0UGEGNqew=' 
  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"
    }
  }
}