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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae0cbe0f6bb437eaf4d60265816062fa39b214b7694566456d36e3f8e6b81e4d' 
  AND token = 'uufAsrhK6qSxVbeqTH7cXj4hQoe/+aYxy2+O+KHHH/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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