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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38a9f9fefcbb2b51268fdace2d411d3cc826efa7badcdc5e8e8a8431d7135043' 
  AND token = 'Uv4uTDINQ4+l+FaF6BusFgnT3bUUye68Zgusj+D75lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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