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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d3f97b34a4f59ffb58aed0c0dd99713c63a938d1a28f950786db3fed8f0a33f' 
  AND token = 'z5IMlLq7kjQx2leVxHuJvxSZJlulH5rVG2joIWpzMjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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