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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd571aa0146c76cd842780f7a119442571623643d110a35c8c62f24b31c3efab3' 
  AND token = 'dJm64/iUflWQFW/HgazZ+lGFQT5JdU4d5UQp5WycCsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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