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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3446bc621e49872073076eb69fd9c8ca518c0b4571f50c6109cad167abd60a7' 
  AND token = 'rUFDS9YjwRRmxLs+HtEWQyukKId3OD0+gFfJxdCdyBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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