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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd53f55d7b03025e0af499c4934168056a2acd9f3f816ed5ade4c24349176cd1f' 
  AND token = 'eQ+/vZc0jLCAWHHCcFiXkyo+LC5r3UoTgfl2ZrlAGWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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