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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd4adae841af21c492bba2847e8b5d43e2bc000d3bfdbc400ee892a541fdfc20' 
  AND token = 'KropnyLZ9E9OLZWwovfOUGcr4qxLaR8YgglLh5MZ98o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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